JPH05219173A - Public telephone set - Google Patents

Abstract

PURPOSE:To enable re-transmitting by executing an redial operation before on-hook when an other party is under calling. CONSTITUTION:CPU 9 controlling the whole part of a public telephone set and MEM 3 storing a callee telephone number which is dialled by a user are provided. When the redial operation which is previously set before on-hook is detected when the other party is under calling, CPU 9 disconnects a line with a communication line SPC 5 so as to generate a DC loop again, to read the callee telephone number which MEM 3 stores, to control a dial transmitting part OSC 4 and to re-transmit a dial signal to the line 11.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to public telephones.

[0002]

2. Description of the Related Art Conventionally, a public telephone of this type has a structure in which a calling party is notified of a busy tone when the other party is busy, and the caller waits for an on-hook operation. Therefore, if the calling party connects to the same called party, go on-hook, then off-hook again, reinsert the coin or prepaid card, and manually enter the called party telephone number again. Was there.

[0003]

SUMMARY OF THE INVENTION In the conventional public telephone set described above, when the other party is busy, the calling party is notified of the busy tone, and the calling party waits for the on-hook operation of the calling party. Therefore, when the calling party connects to the same called party while the other party is busy, the calling party goes on-hook and then off-hook again, reinserts the coin or prepaid card, and then again. The called party telephone number must be manually operated, which is very troublesome in operation.

[0004]

The public telephone of the present invention comprises:
A storage unit that temporarily stores the called party telephone number that was input to make a call, a detection unit that detects a redial operation before on-hook when the other party is busy, and the storage unit that is detected by this detection unit. And a dial transmitting unit for making a redial by using the called party telephone number temporarily stored in.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a case where one embodiment of the present invention is realized by a coin throwing type public telephone.

In FIG. 1, in this embodiment, a coin detecting unit (hereinafter referred to as DET) 1 for detecting coins inserted from a coin insertion slot and the number of coins, and a dial button for inputting a telephone number (hereinafter referred to as DL). ) 2, and a storage unit (hereinafter referred to as MEM) 3 for temporarily storing the telephone number input from DL2,
A clock circuit (hereinafter referred to as TIM) 6 for transmitting a time signal or the like required for the call frequency, a dial transmission unit (hereinafter referred to as OSC) 4 for converting a telephone number input from DL2 into a dial signal and transmitting the dial signal, A call circuit (hereinafter referred to as SPC) 5 that sends and receives a voice signal and the like through the line 11, and sends a reminder sound to the caller at a fixed time or before the basic call time at the end of the number of coins inserted. A reminder sound transmission unit (hereinafter A
UD) 7, a hook switch (hereinafter referred to as HS) 8 for sending on / off signals of a handset (not shown), and a central control unit (hereinafter referred to as CPU) that controls the entire embodiment.
9 and 9.

In this embodiment, a redial operation for inputting a called party telephone number before on-hook when the other party is busy is referred to as a dial operation "# *".

Next, the operation of this embodiment will be described.

First, when the caller picks up the handset, the HS 8 is turned off and an off-hook signal is sent to the CPU 9.

When coins are inserted from the coin slot, DE
At T1, coin insertion is detected, and a detection signal is sent from DET1 to CPU9. As a result, the CPU 9 causes the SPC 5
Is controlled to form a DC loop on the line 11 so that the caller hears a dial tone through the handset, and the caller can dial.

When the calling party dials the called party telephone number from DL2, the dial data is stored in the MEM3 under the control of the CPU 9 while the OCS 4 to the SPC are sequentially stored.
The called party telephone number is sent as a dial signal to the line 11 through the line 5.

Thereafter, the called party answers and the calling party enters the talking state.

A reminder sound is sent to the caller through the AUD 7 or SPC 5 and the handset by the control of the CPU 9 at a fixed time or before the basic call time after the call frequency ends corresponding to the coin amount inserted.

After that, when the CPU 9 receives the on-hook signal from the HS 8, the CPU 9 returns to the initial state and waits for a new call request, and at the same time, the line 11 is sent via the SPC 5.
Disconnect the DC loop with.

After the called party telephone number is sent as a dial signal, the calling party is notified of the busy tone when the called party is busy.

When the calling party wants to connect again with the same called party, "# *" is dialed from DL2 in the off-hook state. The dial data is analyzed by the CPU 9 and judged to be a redial operation.

When the CPU 9 determines that the redial operation has been performed, the DC loop with the line 11 is automatically cut off via the SPC 5, and after a certain time elapses, the DC loop is again applied to the line 11 via the SPC 5. To form. afterwards,
Under the control of the CPU 9, the dial data of the called telephone number temporarily stored in the MEM 3 is read out, and the OSC is read.
4 is transmitted, converted into a dial signal, and transmitted via the line 11.

Subsequent operations are the same as those after the first dial signal is transmitted.

In this embodiment, the coin-insertion type public telephone is explained, but the same can be easily analogized also in the case of a public telephone using a prepaid card.

Further, although the redial operation is the dial operation "# *", it can be easily inferred to use a dedicated button.

[0022]

As described above, according to the present invention, the called party's telephone number input to make a call is temporarily stored in the storage unit, and when the other party is busy, a redial operation is detected before on-hook. Then, by re-calling the called party's telephone number temporarily stored in the storage unit, it is possible to easily reconnect with the other party after on-hook without manually dialing again. In this case, the calling party can call the same called party very easily.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 coin detection part (DET) 2 dial button (DL) 3 storage part (MEM) 4 dial transmission part (OSC) 5 communication circuit (SPC) 6 clock circuit (TIM) 7 reminder sound transmission part (AUD) 8 hook switch ( HS) 9 Central control unit (CPU) 11 lines

Claims (1)

[Claims] 1. A storage unit for temporarily storing a called party telephone number input to make a call, a detection unit for detecting a redial operation before on-hook when the other party is busy, and a detection unit for the detection unit. A public telephone, comprising: a dial transmitting unit for redialing the called party telephone number temporarily stored in the storage unit upon detection.